JSON: write all keys in lower case

Postgresql and MySQL use different cases for database tables (lower
case vs. CamelCase).
To prevent problems, the JSON output converts all keys to
lowercase.

Fixes #493: bareos-webui with MySQL

src/lib/mem_pool.c

@@ -718,6 +718,11 @@ int POOL_MEM::strcpy(const char *str)
    return len - 1;
 }
 
+void POOL_MEM::toLower()
+{
+   lcase(mem);
+}
+
 int POOL_MEM::bsprintf(const char *fmt, ...)
 {
    int len;

src/lib/mem_pool.h

@@ -103,6 +103,7 @@ class POOL_MEM {
    int strcpy(const char *str);
    int strcat(POOL_MEM &str);
    int strcat(const char *str);
+   void toLower();
    size_t strlen() { return ::strlen(mem); };
    int bsprintf(const char *fmt, ...);
    int bvsprintf(const char *fmt, va_list arg_ptr);

src/lib/output_formatter.c

@@ -411,26 +411,30 @@ void OUTPUT_FORMATTER::finalize_result(bool result)
 bool OUTPUT_FORMATTER::json_key_value_add(const char *key, uint64_t value)
 {
    json_t *json_obj = NULL;
+   POOL_MEM lkey(key);
 
+   lkey.toLower();
    json_obj = (json_t *)result_stack_json->last();
    if (json_obj == NULL) {
       Emsg2(M_ERROR, 0, "No json object defined to add %s: %llu", key, value);
    }
-   json_object_set(json_obj, key, json_integer(value));
+   json_object_set(json_obj, lkey.c_str(), json_integer(value));
 
    return true;
 }
 
 bool OUTPUT_FORMATTER::json_key_value_add(const char *key, const char *value)
 {
    json_t *json_obj = NULL;
+   POOL_MEM lkey(key);
 
+   lkey.toLower();
    json_obj = (json_t *)result_stack_json->last();
    if (json_obj == NULL) {
       Emsg2(M_ERROR, 0, "No json object defined to add %s: %s", key, value);
       return false;
    }
-   json_object_set(json_obj, key, json_string(value));
+   json_object_set(json_obj, lkey.c_str(), json_string(value));
 
    return true;
 }
@@ -439,6 +443,7 @@ void OUTPUT_FORMATTER::json_add_message(const char *type, POOL_MEM &message)
 {
    json_t *message_type_array;
    json_t *message_json=json_string(message.c_str());
+
    if (type != NULL) {
       message_type_array = json_object_get(message_object_json, type);
    } else {